Laravel - Facades

简述

Facades提供了static应用程序服务容器中可用的类的接口。拉维尔facades作为提供服务static proxies服务容器中的底层类，提供简洁、富有表现力的语法的优点，同时保持比传统静态方法更高的可测试性和灵活性。
如何创建门面

以下是在 Laravel 中创建 Facade 的步骤 -
- Step 1− 创建 PHP 类文件。
- Step 2− 将该类绑定到服务提供者。
- Step 3− 将该服务提供商注册到
  
  Config\app.php 作为提供者。
- Step 4− 创建类，该类扩展为
  
  照亮\支持\立面\立面。
- Step 5− 将点 4 作为别名注册到 Config\app.php。

外观类参考

Laravel 附带了许多 Facade。下表显示了内置的 Facade 类引用 -

Facade	Class	Service Container Binding
App	Illuminate\Foundation\Application	app
Artisan	Illuminate\Contracts\Console\Kernel	artisan
Auth	Illuminate\Auth\AuthManager	auth
Auth (Instance)	Illuminate\Auth\Guard
Blade	Illuminate\View\Compilers\BladeCompiler	blade.compiler
Bus	Illuminate\Contracts\Bus\Dispatcher
Cache	Illuminate\Cache\Repository	cache
Config	Illuminate\Config\Repository	config
Cookie	Illuminate\Cookie\CookieJar	cookie
Crypt	Illuminate\Encryption\Encrypter	encrypter
DB	Illuminate\Database\DatabaseManager	db
DB (Instance)	Illuminate\Database\Connection
Event	Illuminate\Events\Dispatcher	events
File	Illuminate\Filesystem\Filesystem	files
Gate	Illuminate\Contracts\Auth\Access\Gate
Hash	Illuminate\Contracts\Hashing\Hasher	hash
Input	Illuminate\Http\Request	request
Lang	Illuminate\Translation\Translator	translator
Log	Illuminate\Log\Writer	log
Mail	Illuminate\Mail\Mailer	mailer
Password	Illuminate\Auth\Passwords\PasswordBroker	auth.password
Queue	Illuminate\Queue\QueueManager	queue
Queue (Instance)	Illuminate\Queue\QueueInterface
Queue (Base Class)	Illuminate\Queue\Queue
Redirect	Illuminate\Routing\Redirector	redirect
Redis	Illuminate\Redis\Database	redis
Request	Illuminate\Http\Request	request
Response	Illuminate\Contracts\Routing\ResponseFactory
Route	Illuminate\Routing\Router	router
Schema	Illuminate\Database\Schema\Blueprint
Session	Illuminate\Session\SessionManager	session
Session (Instance)	Illuminate\Session\Store
Storage	Illuminate\Contracts\Filesystem\Factory	filesystem
URL	Illuminate\Routing\UrlGenerator	url
Validator	Illuminate\Validation\Factory	validator
Validator (Instance)	Illuminate\Validation\Validator
View	Illuminate\View\Factory	view
View (Instance)	Illuminate\View\View

例子

Step 1− 创建一个名为的服务提供者TestFacadesServiceProvider通过执行以下命令。


php artisan make:provider TestFacadesServiceProvider

Step 2− 成功执行后，您将收到以下输出 −

Step 3− 创建一个名为TestFacades.php在App/Test.

App/Test/TestFacades.php


<?php
   namespace App\Test;
   class TestFacades{
      public function testingFacades() {
         echo "Testing the Facades in Laravel.";
      }
   }
?>

Step 4− 创建一个 Facade 类，名为“TestFacades.php”在“App/Test/Facades”.

App/Test/Facades/TestFacades.php


<?php
namespace app\Test\Facades;
use Illuminate\Support\Facades\Facade;
class TestFacades extends Facade {
   protected static function getFacadeAccessor() { return 'test'; }
}

Step 5− 创建一个 Facade 类，名为TestFacadesServiceProviders.php在App/Test/Facades.

App/Providers/TestFacadesServiceProviders.php


<?php
namespace App\Providers;
use App;
use Illuminate\Support\ServiceProvider;
class TestFacadesServiceProvider extends ServiceProvider {
   public function boot() {
      //
   }
   public function register() {
      App::bind('test',function() {
         return new \App\Test\TestFacades;
      });
   }
}

Step 6− 在文件中添加服务提供者config/app.php如下图所示。

config/app.php

Step 7- 在文件中添加别名config/app.php如下图所示。

config/app.php

Step 8- 添加以下行app/Http/routes.php.

app/Http/routes.php


Route::get('/facadeex', function() {
   return TestFacades::testingFacades();
});

Step 9− 访问以下 URL 来测试 Facade。


http://localhost:8000/facadeex

Step 10− 访问 URL 后，您将收到以下输出 −

Laravel - Facades

简述

如何创建门面

外观类参考

例子